Explosion-proof temperature controller

Abstract

This utility model relates to electrical engineering. The technical result consists of reducing the load on the network without the need for excessive-power protective automation. An explosion-proof temperature controller comprises a high-strength polyamide housing. A control module is installed inside the housing, including a control board. A control panel and control buttons for setting the temperature are located on the outside of the housing. The housing and board are also connected to an external temperature sensor. The control board includes two triac elements connected in parallel, and their conductivity angle is adjustable by a microcontroller located on the board. The housing is equipped with network cables configured to connect a power source and a load. 3 fig.

Description

[0001] Technical field

[0002] The utility model relates to electrical engineering and heat engineering.

[0003] Technology Level

[0004] The prior art discloses a thermostat (RU 2444863 C1, published 10.03.2012), one heating element rigidly fixed at one or both ends in a fixing unit, a junction box connected to said fixing unit, and an electronic control system, characterized in that the electronic control system consists of a power controller, a temperature controller electrically connected to it, and a temperature sensor installed inside the heating element and electrically connected to the temperature controller, wherein the power controller and the temperature controller are housed in separate housings rigidly connected to the fixing unit or to the junction box and simultaneously installed with a gap relative to each other and to the heating elements, based on the condition of ensuring the exclusion of the influence of heat emitted by the power controller and the heating elements on the operation of the temperature controller,wherein the power regulator contains power semiconductor switching elements located on the inner walls of the housing, and the housing of the power regulator is made ribbed.

[0005] The disadvantage of this solution is the location of the power and temperature regulator in a separate housing, a heavy, massive housing, a complex regulation system, unidirectional conductivity of the circuit, and the use of excess power protective automation.

[0006] Also known in the prior art is an explosion-proof thermostat (CN 120335530 A, published on July 18, 2025) comprising a control module communicatively connected to a communication module, and the main control module is also communicatively connected to a temperature data collection module, an electrical parameter data collection module, a display module, a current output module, and a soft starter module. The temperature data collection module uses a MAX31865 chip connected to a PT100 sensor to collect ambient temperature data. The electrical parameter collection module, based on an HLW8032 chip, collects voltage and current data in real time, calculates power, and activates overvoltage / overcurrent protection. The display module is a 1.4-inch OLED screen that displays temperature, voltage, and current parameters in real time. If the parameters exceed the set value, alarm information will be displayed on the OLED screen.The current output module uses the GP8311 IC to generate a 4-20mA analog signal, which connects to an external display device or control system to provide linear temperature indication.

[0007] The disadvantage of this solution is the complex regulation system, the unidirectional conductivity of the circuit, and the use of excess power protective automation.

[0008] Disclosure of Utility Model

[0009] The problem that the utility model is aimed at solving is to eliminate the shortcomings of the previous level of technology.

[0010] The technical result of the utility model is to reduce the load on the network without the need to use protective automation of excess power, to increase the service life of the heating cable (and other loads), and to allow the use of longer sections of self-regulating heating cables by smoothing the peak of the starting current.

[0011] The specified technical result of the utility model is achieved due to the fact that the explosion-proof temperature controller includes a high-strength polyamide housing, a control module is installed inside the housing, including a control board, on the outside of the housing there is a control panel and control buttons that provide temperature adjustment, also the housing and the board are connected to an external digital temperature sensor, wherein the control board includes two triac elements connected in parallel, and the angle of their conductivity is made with the possibility of regulation by a microcontroller located on the board, wherein the housing is equipped with network cables made with the possibility of connecting a power source and a load.

[0012] Brief description of drawings

[0013] Fig. 1 shows the general view of the explosion-proof temperature controller.

[0014] Fig. 2 is a graph showing how the starting current is smoothed in the utility model, compared to a solution where the starting current is not smoothed.

[0015] Fig. 3 shows an electrical circuit that provides a smooth start of current.

[0016] Implementation of a utility model

[0017] Explosion-proof temperature controller (Fig. 1), including a high-strength polyamide housing 1. The material used is polyamide grades PA 610L-SV30 and PA 6L-SV30.

[0018] A control module including a control board is installed inside the housing.

[0019] The housing is connected to at least one external temperature sensor. This external sensor is a K-type analog sensor and can measure temperatures in the range of -55°C to +600°C. The second temperature sensor is a DS18B20 digital sensor with a measurement range of -55°C to +125°C.

[0020] Temperature readings are collected using an external sensor and transmitted to an internal board, which, depending on the trigger settings, sends commands to close or open a relay mounted directly on the device's board. The electrical parameter collection module is based on the MAX 31855 microcircuit, also mounted on the device's board.

[0021] The control panel and temperature control buttons are located on the outside of the case. The control buttons (K1, K2) are mounted on the circuit board and routed to the outside of the case.

[0022] The temperature controller can be made in two versions:

[0023] with compound filling of the internal space with the ends of the power cables brought out;

[0024] without compound filling, with the possibility of independent connection to internal terminals.

[0025] The control board includes two triac elements connected in parallel, and their conductivity angle can be adjusted by a microcontroller located on the board. The triac elements provide a gradual increase in the input load current, thereby reducing the inrush current and ensuring a smooth start (Fig. 3). Using a circuit with triac elements provides the following advantages:

[0026] Smooth output voltage regulation. Unlike thyristors, which conduct current only in one direction, a triac provides smoother parameter adjustment. This is especially important for sensitive equipment requiring high power supply accuracy.

[0027] Schematic simplification. A triac replaces a pair of back-to-back thyristors, making it more compact and easier to implement.

[0028] Bidirectional conductivity. The triac is capable of conducting current in both directions, making it more suitable for working with AC voltage. This simplifies the circuit and reduces the number of components, as no additional rectifier circuits are required.

[0029] The following elements are shown in Fig. 3:

[0030] D24, D25 - Optocoupler 250V, 190mA, DIP6 SMD.

[0031] R115, R118 - Resistors SMD0603-R (300 Ohm, 5%).

[0032] R114, R116, R117, R119 - Resistors SMD1206-R (330 Ohm, 5%).

[0033] VD10, VD11 - Triacs 40A 800V BTA41-800B.

[0034] R120, R121, R122 - Resistors SMD1206-R (22 Ohm, 5%).

[0035] C50 - Metal film capacitor K73-17 0.01uF 630V 10%.

[0036] X1, X3, X12 - Spring terminal block DG271V-7.5-02P.

[0037] K1 - Electromagnetic relay NRP15-C05D.

[0038] Soft starter is controlled directly by the STM32F103C8T6 processor chip.

[0039] The housing is equipped with cable entries (KV1, KV2, KV3, KV4, KV5, KV6), allowing you to connect the load, connect to a power source, install temperature sensors, and also output dry contact relay cables, a Modbus interface, and a 4-20 mA current loop through them.

[0040] It is possible to transmit data via Modbus (RS-485) protocol, signaling assistance of two dry contact relays, and also transmit data via 4-20 mA current loop.

[0041] The device operates as follows (see Fig. 1):

[0042] Connect the network cable coming from the KV1 input to the power source (220 V, 50 Hz).

[0043] Connect the network cable coming from the KV2 input to the load (220 V, 50 Hz).

[0044] Turns on automatically when power is supplied to the temperature controller.

[0045] Install the diesel fuel temperature sensor in the temperature control area.

[0046] Explosion-proof temperature controller, designed to regulate the operation of heaters (resistive, self-regulating, heating cables, radiator type, etc.), used to maintain the required air temperature or heating of solids, as well as indicating the current temperature of the controlled object, in accordance with the internal algorithm and the ability to adjust the response range of the power load relay within the range from -55 ° C to + 600 ° C in explosive areas of premises and outdoor installations in accordance with the explosion protection marking according to GOST 31610.0-2019, Chapter 7.3 of the Electrical Installation Code and other regulatory documents governing the use of equipment in explosive areas.

[0047] Explosion-proof temperature controller is an explosion-proof temperature controller that can operate in soft start mode in hazardous areas of classes 1 and 2.

Claims

1. Explosion-proof temperature controller, including high-strength polyamide housing, a control module is installed inside the housing, including a control board, On the outside of the case there is a control panel and control buttons that allow you to adjust the temperature, the case and the board are also connected to an external temperature sensor, the control board includes two thyristor elements connected in parallel, and their conductivity angle is designed to be adjustable by a microcontroller located on the board, The housing is equipped with power cables designed to allow connection of a power source and a load.

2. An explosion-proof temperature controller according to claim 1, wherein the external temperature sensor is analog.

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